Titan — John Varley

Here is TITAN: the alien that is, itself, a world.

Here is TITAN: the heralded new novel by SF's most spectacular new talent, the Hugo and Nebula Award winner who has been compared by Isaac Asimov with the early Heinlein.

Here is TITAN: the story of a journey through the awesome interior of a moon-sized being that leads to an encounter with a vast and lonely intelligence. And a proposal.